Double walled panel construction



Oct. 3, 1950 5. B. HEIJMER ETAL DOUBLE WALLED PANEL CONSTRUCTION FiledMarch 5, 1948 ECK I ATTORNEY 2 NM EU vm m m $5M. mm

U A L w mm 6am FIG.

l aiented Oct. 195$ Gustaf Bristol Heijmer, Bror Erik Sandi, and KarlGustaf Trobeck, Stockholm, Sweden Application March 5, 1948, Serial No.52,534 'In Sweden July 23, 1-945 This invention relates to apanelconstruction and the like and'more particularly to adouble walledpanel having supporting means intermediate the spaced walls. 1

The invention is particularly applicable to doors, partitions and thelike,but it will be understood that it is not limited thereto but rnaybe e'm- Yb'o'die'd with advantage in wall construction in gen'eral.

3 inwallconstructions for which .the invention r'einain plane "andsmooth and 'thatlthey do not bend orwar under atmosphericconditions. To:this end, suppbrting members have been. interposed between the spacedwalls "in orderto provid'e supports for and. prevent warping of thepanel sheets. The'spaced walls which may con- .sist ofwood,'plywood,'wallboard'or the like, are usually applied to the sidesof a frame of wood or iother material whichwill provide proper attach-:m'entand support for the panel sheets.

Heretofore, these intermediate supports have usually been in thenatureof ribs arranged in 1 lattice-like 'fliifiiatioh or "of spaced membersof woodfwhich are glued tothe interior surfaces-of itlie side panels. aa

*Th'e'se c'onventional constructions, "however,

3 have shwn atendencyto causecmmnuyeero :mations of the panel sheets.The deformations might be partly avoided by glueing greater por- .tionsof the panel sheets to thefiller material, ibut this method requires toomuch glue. It has :also been proposed to use relatively soft mateirialas filler between the walls in order to avoid ;such deformations, butthis construction does ,not render the bond between the panel sheetssufficiently'rigid to counteract the tendency of the panel sheets towarp or bend.

vIt is therefore among the objects of the present invention to provide adouble walled panel construction which has a supporting structurebetween the walls which possesses sufficient rigidity to provide a firmbond between the walls and still afford elasticity sufficient to preventdeformation of the panel sheets at the points of attachment between thespaced panels and the intermediate supporting structure.

Additional objects and advantages inherent in the invention will becomemore apparent from the following specification taken in conjunction withthe accompanying drawings which disclose by way of example a preferredand a modified embodiment of the inventive concept.

In the drawing: a

Figure 1 is a longitudinal section of a door em- 2 claims. (ciao-0.5)

hodying the invention showing its adjustment-b a dcor frame-whichhasbeen partially shown in "broken lines.

p I; Figure 2 is a fragmentary front elevation show}- YES intended,'itis important that thepanel sheets i x'ingna portion of one of the sidepanels :broken away.-

Figure 3 is-a longitudinal section similar to liig "ure lshowing amodification, and Figure 4 is a fragmentary front elevation simi alaritohFigure 2 showing the modification illuse v trated in Figure 3.

JIhe aforesaid may be obtained-bycombining a relatively hard materialwith a relativelysoft j material in the intermediate supporting struc'ture.

LfiMore specifically the invention contemplates zarwa'llbonstructioncomprising a pair of spaced :panels,- whichpanels are applied toopposite sides :cifaaf frame, and between which panels is-arranged tanintermediate supporting structure consisting of a;series-.of.-ribs of.relatively hard and rigid imaterial, 'jwhich ribs are free -of directicontaet with the panels and are providedonseither one 0r-'on both sides:with-a relatively soft material which@projects'beyond .the ribs soas-to contact theipa'nels and exert a slight pressure there- :against. 4Referringini greater detail to the drawing iin which the same referencecharacters serve to indicate the same or analogous parts, the panels 16,which may consist of plywood, fiber, wood, wallboard, plastic or othersuitable material, are connected to the frame H, which may consist ofwood, deadwood or some other suitable material. In the particularembodiments shown in the drawing, the frame is recessed at oppositesides to engage the frame [2 of the door opening which has been shown inbroken lines since it does not form part of the invention. One side ofthe door may be hinged to the frame l2 as at i3. Between the panels Illare arranged a series of spaced ribs M of relatively hard and rigidmaterial, such as hard wallboard, plywood, hard fiber, wood, etc. Theseribs preferably extend from one side of the frame to the other. In theembodiment shown in Figure 1, these ribs are arranged with their widersides parallel to the panels 10.

To the ribs iii are attached members It: of relatively soft materiaLsuchas porous wallboard,x and which members are of such thickness that theyare subjected to a slight pressure by the panels It When the latter areadjusted to the frame H. l

3 The members 15 may be covered with glue or similar material prior tothe assembling process and in this manner they will become glued to theinterior surfaces of the panels when the latter are pressed on to theframe II.

The modification shown in Figures 3 and i differs from the embodimentshown in Figures 1 and 2 in that the ribs [4 are arranged with theirwider sides perpendicular to the panels l0. It is important, however,that the edges 16 of these ribs are free of direct contact with theinterior surfaces of the panels. On the other hand, the members [5 havebeen selected of such width or height that they exert a slight pressureagainst the interior surfaces of the panels when the latter are adjustedto the frame H.

In the embodiments shown in the drawing, the members If: have been shownas individual pieces attached to the ribs i l in spaced relationshipfrom one another and the pieces on adjoining ribs arranged in alternatefashion. It should be understood, however, that various otherarrangements may be made without departing from the invention;Furthermore, instead of consisting of individual pieces, the members 15may consist What is claimed is:

1. A double walled panel construction comprising a pair of spacedpanels, a series of relatively spaced and comparatively thin ribs-ofsubstantially rigid material extending between said panels and beingspaced from the interior surfaces of said panels, and a series ofcomparatively thick members of resilient material spaced along each ofsaid ribs and engaging the interior surfaces of said panels inpressure-urged relationship.

2. A double walled panel construction comprising a frame, a pair ofspaced panels, a series of relatively spaced and comparatively thin ribsof substantially rigid material extending between said panels andconnected to opposite frame members, said ribs being spaced from theinterior of a continuous strip, but in this case it might be bers l4about 2% larger than the size they will have when glued to the panels.

It will be understood that by reason of the relatively soft orcompressible members [5 which are fixed to the relatively stiff ornon-compressible ribs 14 and exert a slight pressure against theinterior surfaces of the panels 10, a firm and still --resilient bond isprovided between the panels which is free of theobj'ections connectedwith a supporting structure composed entirely of either rigid or softmaterial.

It should also be emphasized that this descrip tion has been given byway of example and not byway of limitation. On the other hand, theinvention lends itself to a variety of expressions within the scope ofthe following claims.

members of resilient material spaced along each of said ribs andengaging the interior surfaces of said panels in pressure-urgedrelationship, saidmembers being spaced along said ribs in alternatingrelationship to the members on the adjoining rib so that said members onone rib will be located in the spaces between the members on theadjoining rib.

GUSTAF BRISTOL HEIJMER,

BROR ERIK SANDA.

KARL GUS'IAF TROBECK.

REFERENCES CITED The following references are of record in the f le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,333,141 Toles Mar. 9, 19201,951,217 Slocum Mar. 13, 1934 2,304,718 Swart Dec. 8, 1942

